CONTROL METHOD OF HIGH-SPEED WAVELENGTH VARIABLE LASER, AND WAVELENGTH CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent an oscillation wavelength from being fluctuated by heat during wavelength switching in a TDA-DFB laser array.SOLUTION: When performing wavelength switching in a TDA-DFB laser array 100, an active layer current Ia injected to an active waveguide layer 2 of a TDA-DFB laser is fixed and a control layer current It injected to an inactive waveguide layer 3 is made into a current having a waveform of a time constant equal to or smaller than a time constant of a wavelength change by determining a current value corresponding to a desired wavelength on the basis of a correspondence between a previously measured wavelength and the injection current to the inactive waveguide layer 3, on the other hand. Further, a current is injected to an inactive waveguide layer of a neighboring TDA-DFB laser to operate as a heat compensation mechanism, Waveforms of the active layer current Ia, the control layer current It and a heat compensation current are formed so as to fix the amounts of all the currents injected to the TDA-DFB lasers within the TDA-DFB laser array 100.